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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
2
|
| pubmed:dateCreated |
1982-3-13
|
| pubmed:abstractText |
A resting cell of Escherichia coli lacking thiamin kinase incorporated external thiamin with an energy-dependent counterflow efflux (C-efflux). This C-efflux could be separated frm an energy-dependent exit by a selective inhibition of exit by 2 x 10(-2) M NaN3. The extracellular thiamin could be replaced by thiamin diphosphate, resulting in the same rate of C-efflux, but the rate of C-efflux of intracellular thiamin diphosphate against the external thiamin was markedly low. This low rate of C-efflux of thiamin diphosphate could explain the higher accumulation of the compound than that of free thiamin in the thiamin-kinase-defective mutant as well as in its wild-type parent. Basic characteristics of free thiamin uptake and exit in E. coli W mutant were compared with those reported in K 12 mutant: a marked difference existed in the rate of exit. The low rate of exit in E. coli W 70-23-102 was inferred as the reason for the absence of an overshoot phenomenon of thiamin uptake in this strain.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Dec
|
| pubmed:issn |
0006-3002
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:day |
7
|
| pubmed:volume |
649
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
419-26
|
| pubmed:dateRevised |
2006-11-15
|
| pubmed:meshHeading | |
| pubmed:year |
1981
|
| pubmed:articleTitle |
Counterflow efflux of thiamin in Escherichia coli.
|
| pubmed:publicationType |
Journal Article,
Comparative Study
|